Honestly? I loved the couch gag. While I didn't particularly like how it ended, the TV falling down is what made it up for me. As mentioned before, Homer getting run into the door was great. Wonder if that'll be a permanent change in the intro.
Honestly? The animation didn't quite impress me as I had hoped it would. Though the original intro is outdated by today's standards, the actual animation itself was rather fluid. Here, it feels a little bit stiffer and not as much movement. Not quite sure how to explain it, really. The changes and additions to the intro were nice though, but not so much the animation.
But that's the only real complain. It's been ages since I really sat down to watch The Simpsons, partially because of the declining quality of the series. However, I might check out the episode this sunday, to see how it holds up in general in HD.